-=> Quoting James R. Cook to Phil Crown <=-



 JRC> Isn't DosRead supposed to block if no bytes are available to be read?

 JRC> I'm playing with serial I/O threads and if DosRead doesn't ever block

 JRC> on a read from the comm port, there's no reason for the overhead of a

 JRC> thread, mutex semaphore and all that other garbage.  Thanks!

 

 PC> Yes, DosRead will block, but you have to tell the com port which mode

 PC> to use.

 JRC> 

 JRC> Ach.  You can do that on ports that are already open?  i.e. a little

 JRC> shim that sits between a BBS and it's mailer?



Yes, it could be a shim, or a layer between the calling app and the

called app, but it could also be built-in to the program.



I know P.EXE (the freeware Zmodem package) makes changes (to the

read/write timeout, at least) when it is passed a com port handle.



Phil Crown

pcrown{at}airmail.net

http://web2.airmail.net/pcrown/



--- Blue Wave/OS2 v2.30